Edited candidate model.

app/models/candidate.rb

@@ -5,12 +5,25 @@ class Candidate
 
   belongs_to :constituency
   belongs_to :party
+  has_many :votes
 
   alias_method :to_s, :name
 
   def name_and_party
     "%s (%s)" % [name, party.name]
   end
+
+  def share_of_vote
+    if constituency.vote_count > 0
+      "%0.1f%%" % (100 * votes.count / constituency.vote_count.to_f)
+    else
+      '-'
+    end
+  end
+
+  def vote_count
+    @vote_count ||= votes.count
+  end
 
 end